What unlocks new training from the masters?

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Pretty simple question, what unlocks new training levels with the masters?
Above you can see I've completed training from Piccolo and done some training from Krillin, however I've not figured out what causes new training to unlock with each master. How do I unlock further training with Krillin?
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How do you train with the masters in Xenoverse?
Masters are unlocked as you beat them in the story battles. For instance, to unlock Master Cell, you must finish the Cell Saga. After you have unlocked them, you will need to speak with them in Tokitoki city. You will then be challenged to a fight, and should you win, they will train you.How do you unlock all masters in Xenoverse 2?
If you get a Z rank on all the advancement tests, you'll be able to take a bonus test which gives you Unlocked Potential upon completion. Originally posted by GrandMajora: Masters become available as you complete the main story. You should have most of them unlocked by the time you complete the BoG story.How do you unlock new instructors in Xenoverse 2?
Instructor Info They are known people from the story, and unlock after completing certain story missions. You also get access to high level lessons and instructors by raising your academy level.*Must Watch* How To Unlock \u0026 Get Your MENTOR/SENSEI Abilities Perks In Shindo Life!
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Images: Max Vakhtbovych, Ksenia Chernaya, Ksenia Chernaya, George Milton